Feature request: Add setting to disable tab-to-accept suggestions

Description

The recent update introduced tab-to-accept suggestions that appear while typing. This can be disruptive to some workflows.

Request

Add a setting to disable/suppress the auto-suggestions feature, for example:

{
  "suggestions": {
    "enabled": false
  }
}

Or similar configuration option in ~/.claude/settings.json.

Rationale

• Some users find the suggestions interrupting their thought process
• The feature appears to have no opt-out mechanism currently
• Having user choice for UI features improves the experience for diverse workflows

Thank you!